If you're spotting dinosaurs in Argentina be sure to look out for this placid plant eater - and, at this size, it shouldn't be too difficult to find.

Getting bigger

Plant eaters continue to get bigger as the reign of the dinosaurs goes on. Food is plentiful, and its size enables this larger dinosaur to reach taller vegetation. There's also a measure of security; Riojasaurus is just too big for most carnivores to take on.

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